21110111012 has 12 divisors (see below), whose sum is σ = 39115794060. Its totient is φ = 9934169856.

The previous prime is 21110111003. The next prime is 21110111041. The reversal of 21110111012 is 21011101112.

It can be written as a sum of positive squares in 2 ways, for example, as 18370007296 + 2740103716 = 135536^2 + 52346^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21110110984 and 21110111002.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155221337 + ... + 155221472.

It is an arithmetic number, because the mean of its divisors is an integer number (3259649505).

Almost surely, 2^21110111012 is an apocalyptic number.

It is an amenable number.

21110111012 is a deficient number, since it is larger than the sum of its proper divisors (18005683048).

21110111012 is a wasteful number, since it uses less digits than its factorization.

21110111012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310442830 (or 310442828 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 21110111012 its reverse (21011101112), we get a palindrome (42121212124).

The spelling of 21110111012 in words is "twenty-one billion, one hundred ten million, one hundred eleven thousand, twelve".